what if they embrace new technology instead? ♪ imagine a company's future with the future of trading. company profile. a research tool on thinkorswim. from td ameritrade. >>> the government does not respect the constraints that the constitution places on the government. abraham lincoln talks about our revolutionary right to over throw it. >> that was whether or not president obama was holding up his constitutional duty to faithfully execute the nation's laws and what the consequences are if he is not. and the testimony got fierce, at times. >> i agree entirely that the president cannot simply refuse to enforce a law for policy reasons. >> the center of gravity is shifting. and that makes it unstable. and within that system you have the rise of an uber-presidency. there could be no greater danger for individual liberty. >> if the people come to believe the government is no longer constrained by the laws, they will conclude that neither are they. >> as james madison warned, the accumulation of all powers, legislative, executive